Sand drops from a stationary hopper at the rat of `5 kgs^(-1)` onto a conveyor belt moving with a constant speed of `2 ms^(-1)`. What is the force required to keep the belt moving and what is the power delivered by the motor moving the belt ?

Explanation

Impulse j = Ft = mv, `F = (mv)/(t)`
`v=2ms^(-1),(m)/(t)=5kgs^(-1)rArrF=10N`
power `P=(W)/(t)=(Fs)/(t)=Fv` `=10xx2=20` walt.